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Article Abstract
The low utilization of visible light and the fast recombination of photogenerated electron-hole pairs are the two intrinsic defects that have hindered the antibacterial applications of TiO. The addition of organic photocatalytic agents to form heterojunctions with TiO powder can effectively address these problems. A novel linear conjugated polymer poly[(thiophene-ethylene-thiophene)-thiophene-3-carboxylic acid decyl ester] (PTCD) was successfully synthesized Stille coupling polymerization. PTCD and TiO can form a heterojunction photocatalyst (PTCD/TiO), and this product was characterized using NMR and XRD. The UV-vis spectra showed that the absorption edge of the PTCD/TiO heterojunction extends to approximately 700 nm, which indicates that the visible-light utilization is greatly improved. () was selected as the target organism to test the photocatalytic antimicrobial activity of the material. Photogenerated electrons can undergo directional transmission of the PTCD polymer to TiO on the PTCD/TiO heterojunction to realize excellent antibacterial properties. With an optimized PTCD loading ratio of 30%, PTCD/TiO showed an antibacterial rate that was 14.5 times greater than that of pure TiO in 4 h under visible-light irradiation.
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